Use this calculator to estimate how much alcohol is in your blood stream, and how your blood alcohol content relates to the legal limit for driving in Australia. The tool considers your weight, and how many drinks you’ve consumed in a given period of time, to provide a rough calculation of your Blood Alcohol Concentration.

Calculate your blood alcohol concentration

This tool can be used to provide a rough estimate of your individual blood alcohol concentration (BAC) after consuming a defined amount of alcohol in a single sitting. Please remember this is an estimate and it will not be 100% accurate, as there are a wide range of factors that can affect BAC in individuals (such as the amount of food eaten, type of drinks consumed and metabolic rate) and these are not taken into consideration when using this tool. Therefore, under no circumstances should this tool be used to determine whether you should drive. The only way to be totally sure that you remain under the legal BAC limit is not to drink any alcohol at all.